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    <title>Document</title>
    <script>

        var str = 'apple-pie';
        var o = {};
        for(var i=0; i < str.length;i++){
            var chars = str.charAt(i);
            if(o[chars]){
                o[chars]++;
            }
            else{
                o[chars] = 1;
            }
        }
        console.log(o);

        // 遍历对象
        var max = 0;
        var ch = ''
        for(var k in o){
            // k是属性名
            // o[k]才是属性值
            if(o[k] > max){
                max = o[k];
                ch = k;
            }
        }
        console.log(max);
        console.log('最多的字符是：' + ch);




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